[jdk17u-dev] RFR: 8300696: [AIX] AttachReturnError fails [v2]

[Deepa Kumari]

> This PR backports the change reported in [JDK-8300696](https://bugs.openjdk.org/browse/JDK-8300696).

Deepa Kumari has updated the pull request incrementally with one additional commit since the last revision:

  Modified dll_unload()

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Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/1896/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/1896/files/75829754..3b6c846c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1896&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1896&range=00-01

  Stats: 12 lines in 1 file changed: 10 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1896.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1896/head:pull/1896

PR: https://git.openjdk.org/jdk17u-dev/pull/1896